Edwin jenkins and alexandeb law



UNITED STATES PATENT, OFFICE,

EDWIN JENKINs AND ALEXANDER LAW, OE MELBOURNE, AND WILLIAM PRICE, FOARLTON, vIoTORIA.

PROCESS OF ANNEALlNG CHILLED AND OTHER IRON CASTINGS.

SPECIFICATION forming part of Letters Patent No. 282,728, dated August7,1883,

Application filed June 27, 1883. (No specimens To all whmn it mayconcern Be it known that we, EDWIN JENKINS and ALEXANDER LAW, bothsubjects of the Queen of Great Britain, residing at Exhibition Street,Melbourne, in the British colony of Victoria,

founders, and William Price, also a subject of A temperature in aliquid, and the object is to I -metal.

make them so that they can be punched, bored, tapped, and so on asreadily as wrought At present they are too brittle for this kind oftreatment; but by our process they are converted into such a conditionas to be readily manipulated in this way. The par ticular point in theprocess is the temperature at which the metal is to be dipped into theliquid.v This point is just when it is reduced to a dull red heat, whenthe redness'is about to disappear. The liquid in which it is immersedmay be of any character not known to be inimicable to the character ofiron-such as acids or acid salts-but we have obtained the best resultsfrom a solution of trcacle and water at a specific gravity of 1.005.

best results.

\Vhen the castings can be taken from the chill or from the sandsufficiently hot for the process, We dip them directly into the liquid;but when they cannot retain the proper heat for the act of dipping, wereheat them in an oven or chamber a little beyond the necessarytemperature, and then allow them to cool to the point of dull redness,as before described, when we plunge them into a liquid, as beforestated, and allow them to cool, when theprocess is completed. 7

We have tried various kinds of liquids in which to dip the castings, andfound them all to answer more or less Well so long as acids and acidsalts were avoided; but we have found that the solution of treacle andwater at the gravity we have mentioned gives the Ve do not, however,confine ourselves to any particular kind of liquid in which to dip thecastings; but

\Vhat we believe to be new, and therefore claim as our improved processof annealing chilled and other iron castings, is-

The sudden immersion of such castings when at a dull red heat inaliquid, and in preferably a liquid consisting of treacle and water of aspecific gravity of 1.005, substantially as and for the purposes hereindescribed and eX- plaincd.

EDWVIN JENKINS. ALEXANDER LAW. WVILLIAM PRICE.

\Vitnesses: e

G,WV. KNoTTs, WALTER SMYTIIE BAYsToN.

